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When a client accesses a server's web service, The client sends a message to the network card, The tcp/ip stack is part of the kernel, Therefore, the client information is transferred to the web service in user space through the kernel's TCP protocol, At this time, the destination destination of the client message is on the socket (IP: Port) that the web service is listening for. When a web service needs to respond to a client request, The destination destination of the response message sent by the web service is the client, At this time, The IP and port that the web service listens on becomes the origin instead, As we said, Netfilter is the real firewall, It is part of the kernel, Therefore, if we want the firewall to achieve the goal of "fire prevention", You need to set up checkpoints in the kernel. All incoming and outgoing messages have to pass through these checkpoints. After checking, those that meet the release conditions can be released, while those that meet the blocking conditions need to be blocked. As a result, input checkpoints and output checkpoints appear. These checkpoints are not called "checkpoints" but "chains" in iptables.《大唐小吃货》讲述了美食主播意外穿越来到唐朝，凭借自己超越朝代的特色厨技，携手隐藏身份的帮派少主以及流落街头的富家公子，在一起开办了风靡长安的酒楼后，共同品尝生活滋味并实现美好爱情的故事。上古洪荒时代，轩辕黄帝与蚩尤之间展开一场声势浩大的战争！蚩尤为统霸天下，不惜将灵魂出卖给妖魔魑魅……战争中父母双亡的孤儿星虎被林中老虎抚养长大，与善良的女孩燕儿互生爱慕，村长破天受魑魅蛊惑，意欲横刀夺爱。燕儿为救星虎而死，星虎邪火攻心！神农氏与玉兔化成的爱徒雪怜及时赶到，将星虎带回药王仙山医治。Netflix西语剧集《名校风暴》宣布续订第2季，全部8集用4K超高清摄像机拍摄，预计2019年上线。花明月是名副其实的名媛青春版“千颂伊”，甜美娇俏集万千宠爱于一身；秦东海曾任消防中队中队长，退役后留学英国并以优异的成绩学成归来入职花氏集团，外表高大有型、硬朗帅气，实则却是一个“少女心”十足的反差萌硬汉。二人不打不相识开启了一场斗智斗勇、相爱相杀的“养成系”恋爱故事。　　朱棣微服出巡，来到县城，此时各路人马也暗暗涌入。最终在三个女人的帮助下，朱棣拿到自己想要的物件，起兵夺位，坐上龙椅，封包三姑为御妹，书生也顺利当上县令。There are five kinds of creation modes (1-5): factory method mode, abstract factory mode, singleton mode, builder mode and prototype mode.